What is the oldest known dated coin using the common era dating system? I have a Lithuania Half Grosz silver coin dated 1511 and haven't seen any coins older than that with a date on them. Just curious as I couldn't find much out there on the topic.
When you're talking about dated coins are you talking about coins with a date on them, or the oldest coin in general?
This book catalogs coins from Ancient Greece to about 500 BCE.
If it's the first question then /u/Cieper already provided that answer.
Edit: Okay. I re-read the question, it's early, and OP's question was indeed answered so mine is more of a bonus informational fact. With that, another bonus:
The earliest dated coin in the hoards is the drachm of Peroz, marked with the 6th year of his reign and minted at Abarshahr (Source/Image), but it's not using the current CE/BCE system. Around 480 CE.